This undated photo provided by the U.S. Air Force shows Air Force Gen. William Shelton, the commander of Air Force Space Command, Peterson Air Force Base, Colo. Shelton addressed the National Space Symposium in Colorado Springs, Colo., on Tuesday, April 12, 2011. He said he expects no increases in his budget but said demands for such critical services as the military-run Global Positioning System won't decline. He told space contractors that the military and industry must find a way to contain costs, especially on launches. (AP Photo/U.S. Air Force)
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